Like a wisp of smoke from a genie bottle, the mouth of this 100km-long river snakes mysteriously across the inky-blue landscape. With sheer cliffs, tumbling rapids and craggy, snow-capped peaks, this is a raw, dramatic place where active volcanoes rumble away under the ice caps. Days after global aviation routes were brought to a grinding halt due to the sudden eruption of a famously tricky-to-pronounce volcano nearby, the river flooded its banks when water and ice from melting glaciers filled it to capacity. As well as carrying millions of tons of sediment and sand down to the lowlands and out to sea, this south-flowing waterway has carved out a 200-metre-deep gorge along its route. The gaping green canyon is a popular stop for hikers along a 55km trek known as 'hot spring road'. Where are you?

Identify the place described above, and its location, then go to our competition page to enter the answer and your details to be in with the chance of winning a holiday to the Caribbean. The competition closes on 30 November 2016.